preston



A. E. PRESTON.

PUMP PLUNGER. APPLICATION FILED APR.28.1915.

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INVESTOR ATTORNEY A. E. PRESTON.

PUMP PLUNGER.

APPLICATION FILED APR.28, 1915.

Patented Aug. 22, 1916.

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INVENTOR A'x'ronsx-:Y

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ARCHIBLD E. PRESTON, OF FILLIVIORE, CALIFORNIA.

PUMP-P LUNG'ER.

. Application filed April 28, 1915. Serial No. 24,458.

To all whom t may concern:

Be it known that I, ARCHIBALD E. PRES- TON, a citizen of the United States, residing at Fillmore, inthe county of Ventura -and State of California, have invented newv and useful Improvements in Pump-Plun-V gers, of which the following is a speclfication.

and in a greater or less time does not t the barrel, allowing the iuid or oil to slip past until inally the 'pump no longer operates. Furthermore, the wear allows sand to settle around the plunger-and prevents `it from operating, this beingV known as Sanding up a pump.

The ob]ect of the present invention is to provide a plunger which eliminates the necessity of grinding and fitting with relation to the barrel, and, furthermore, to' provide a plunger which automatically takes up the wear by the expansion of thecomponent parts, obviating the troubles heretofore mentioned.v

Further objects will hereinafter appear.

The invention consists of the parts and the construction andvcombination of parts as hereinafter more fully described and, claimed, having reference to the accompany: in drawings, in whichigure l'is a side elevation of the plunger. Fig. 2 is a vertical, central section through same. Fig. 3 is a cross section on line 3,-3 of Fig. V1. Figt4is-a side elevation, showing a modification of the construction employed in Fig. 1. Fig. 5 is avertical,

central section lthrough Fig. 4. Fig. 6 is a cross section on line 6-6 of Fig. 4. l

More particularly described, the preferred form of plunger shown in Figs. 1, 2 and 3 consists of an inner cylinder 2, exteriorly of which is mounted a split sleeve 3, the length of which is practically the same as the inner cylinder 2. Mounted exteriorly of the'split sleeve 3are two similar sleeves 4 and 5, and securing said expansion sleeves with relation to cylinder 2 is an upper and a lower nut 6 and 'Z respectively. 8 indicates gaskets of suitable material .interposed between the expansion sleeves and the nuts. rIhese gaskets are provided for the purpose of preventing the admission of sand between the inner cylinder and the expansion sleeves and are mounted sufficiently loose to permit the sleeves to gradually expand as wear takes place. The upper nut 6 may be provided with an exterior thread 9 to receive the upper cage or valve (not here shown).

Referring to Figspl and 2, it will be seen that the splits in the exterior sleeves 4 and 5 are offset with relation to each other or set out o f alinement for the purposeof preventing leakage therethrough. rIhe sleeves are Specicatio eters Patent. Patented Amig., 22, llllllfi.

secured or retained in this position by means of pins or rivets 10 secured in the inner sleeve 3 and projecting into slots 11 formed on the respective exterior sleeves. The sleevesl are thus freeto expand as wear takes place but are at the same time prevented from turning with relation to each other, thus obviating any possibility of the sleeves or openings in the sleeves fromoming into alinement. By this construction, grinding or close fitting of the plunger with relation to the barrel is obviated and at the same time wear is automatically taken up, as the sleeves will gradually and automatically expand as wear takes place.

In Figs. 4, 5-and 6 a modification has been shown. In this instance the inner cylinder 2 n c e l l The lnner'expanslonsleeve 3 1s also entlrely;

eliminated and in its place two split sleeves 4a and 5L have been provided. The faces of these sleevesv are provided ,with a plurality of annular grooves 14 in each of which is mounted a common expansible piston ring 15, vsuch as is commonly used in onnection with vinternal combustion engines; the main` expansion sleeves 4a and 5a being secured in position by means of a lowernut 16. This vparticular type ofplungeris very eiicient where little-or no sand is encountered, while the-plunger shown in Figs. 1, 2 and 3 is particularly constructed where sand in greater or less quantities is contalned 1n the oil.

A plunger constructed as here shown can u be cheaply manufactured as exact fitting and grinding with relation to the barrel is entirely eliminated. The automatic expansion of the several sleeves provided prevents vleakage past the plunger and at the same time takes up all the wear both ,in the barrel and on the plunger, thus obviating all the troubles heretofore mentioned including sanding up of the pump. The plunger can be made in any length from a few inches to several feet and may be used for other purposes besides oil well pumps.

The materials and finish of the severalv yparts of the apparatus are such as the eX-.

perience and judgment of the manufacturer may dictate. I wish itunderstood that variouschange in form, proportions and minor details 0f construction may be resorted to within the scope ofthe appended claim and that I do not wish to limit myself to the specific. de-

p sign and'construction here shown.

v'to' form a circumferential slot for freely receiving onel of said pins whereby limited sliding movement between the inner and Outer sleeves is obtained.

In testimony whereof I have hereunto vset myhand in the presence of two subscribing witnesses. ARCHIBALD E.I PRESTON. Witnesses:

I-I. L. HAMILTON, W. E. GoAN. 

